The get_format function in utils/formats.py in Django before 1.7.x before 1.7.11, 1.8.x before 1.8.7, and 1.9.x before 1.9rc2 might allow remote attackers to obtain sensitive application secrets via a settings key in place of a date/time format setting, as demonstrated by SECRET_KEY.
https://www.djangoproject.com/weblog/2015/nov/24/security-releases-issued/
https://github.com/django/django/commit/316bc3fc9437c5960c24baceb93c73f1939711e4
http://www.ubuntu.com/usn/USN-2816-1
http://www.securitytracker.com/id/1034237
http://www.securityfocus.com/bid/77750
http://www.debian.org/security/2015/dsa-3404
http://rhn.redhat.com/errata/RHSA-2016-0158.html
http://rhn.redhat.com/errata/RHSA-2016-0157.html
http://rhn.redhat.com/errata/RHSA-2016-0156.html
http://rhn.redhat.com/errata/RHSA-2016-0129.html
http://lists.opensuse.org/opensuse-updates/2015-12/msg00017.html
http://lists.opensuse.org/opensuse-updates/2015-12/msg00014.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174770.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173375.html